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Japanese Journal of Ophthalmology
Published in: Japanese Journal of Ophthalmology 3/2018

01-05-2018 | Clinical Investigation

Detection of increase in corneal irregularity due to pterygium using Fourier series harmonic analyses with multiple diameters

Authors: Keiichiro Minami, Kazunori Miyata, Atsushi Otani, Tadatoshi Tokunaga, Shouta Tokuda, Shiro Amano

Published in: Japanese Journal of Ophthalmology | Issue 3/2018

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Abstract

Purpose

To determine steep increase of corneal irregularity induced by advancement of pterygium.

Methods

A total of 456 eyes from 456 consecutive patients with primary pterygia were examined for corneal topography and advancement of pterygium with respect to the corneal diameter. Corneal irregularity induced by the pterygium advancement was evaluated by Fourier harmonic analyses of the topographic data that were modified for a series of analysis diameters from 1 mm to 6 mm. Incidences of steep increases in the asymmetry or higher-order irregularity components (inflection points) were determined by using segmented regression analysis for each analysis diameter.

Results

The pterygium advancement ranged from 2% to 57%, with a mean of 22.0%. Both components showed steep increases from the inflection points. The inflection points in the higher-order irregularity component altered with the analysis diameter (14.0%–30.6%), while there was no alternation in the asymmetry components (35.5%–36.8%). For the former component, the values at the inflection points were obtained in a range of 0.16 to 0.25 D.

Conclusion

The Fourier harmonic analyses for a series of analysis diameters revealed that the higher-order irregularity component increased with the pterygium advancement. The analysis results confirmed the precedence of corneal irregularity due to pterygium advancement.
Literature
1.
Lin A, Stern G. Correlation between pterygium size and induced corneal astigmatism. Cornea. 1998;17:28–30.CrossRefPubMed
2.
Stern GA, Lin A. Effect of pterygium excision on induced corneal topographic abnormalities. Cornea. 1998;17:23–7.CrossRefPubMed
3.
Tomidokoro A, Oshika T, Amano S, Eguchi K, Eguchi S. Quantitative analysis of regular and irregular astigmatism induced by pterygium. Cornea. 1999;18:412–5.CrossRefPubMed
4.
Gumus K, Erkilic K, Topaktas D, Colin J. Effect of pterygia on refractive indices, corneal topography, and ocular aberrations. Cornea. 2011;30:24–9.CrossRefPubMed
5.
Nejima R, Masuda A, Minami K, Mori Y, Hasegawa Y, Miyata K. Topographic changes after excision surgery of primary pterygia and the effect of pterygium size on topographic restoration. Eye Contact Lens. 2015;41:58–63.CrossRefPubMed
6.
Kaufman SC, Jacobs DS, Lee WB, Deng SX, Rosenblatt MI, Shtein RM. Options and adjuvants in surgery for pterygium: a report by the American Academy of ophthalmology. Ophthalmology. 2013;120:201–8.CrossRefPubMed
7.
Tomidokoro A, Miyata K, Sakaguchi Y, Samejima T, Tokunaga T, Oshika T. Effect of pterygium on corneal spherical power and astigmatism. Ophthalmology. 2000;107:1568–71.CrossRefPubMed
8.
Yilmaz S, Yuksel T, Maden A. Corneal topographic change after four types of pterygium surgery. J Refract Surg. 2008;24:160–5.PubMed
9.
Shiotani Y, Maeda N, Inoue T, Watanabe H, Inoue Y, Shimomura Y, et al. Comparison of topographic indices that correlate with visual acuity in videokeratography. Ophthalmology. 2000;107:559–64.CrossRefPubMed
10.
Oshika T, Tomidokoro A, Maruo K, Tokunaga T, Miyata N. Quantitative evaluation of irregular astigmatism by Fourier series harmonic analysis of videokeratography data. Invest Ophthalmol Vis Sci. 1998;39:705–9.PubMed
11.
Miyata K, Otani S, Honbou N, Minami K. Use of Scheimpflug corneal anterior-posterior imaging in ray-tracing intraocular lens power calculation. Acta Ophthalmol. 2013;91:e546–9.CrossRefPubMed
12.
Meacock WR, Spalton DJ, Boyce J, Marshall J. The effect of posterior capsule opacification on visual function. Invest Ophthalmol Vis Sci. 2003;44:4665–9.CrossRefPubMed
13.
14.
Tanabe T, Tomidokoro A, Samejima T, Miyata K, Sato M, Kaji Y, et al. Corneal regular and irregular astigmatism assessed by Fourier analysis of videokeratography data in normal and pathologic eyes. Ophthalmology. 2004;111:752–7.CrossRefPubMed
15.
Tomidokoro A, Soya K, Miyata K, Armin B, Tanaka S, Amano S, et al. Corneal irregular astigmatism and contrast sensitivity after photorefractive keratectomy. Ophthalmology. 2001;108:2209–12.CrossRefPubMed
16.
Schuster AK, Tesarz J, Vossmerbaeumer U. The impact on vision of aspheric to spherical monofocal intraocular lenses in cataract surgery: a systematic review with meta-analysis. Ophthalmology. 2013;120:2166–75.CrossRefPubMed
17.
Schuster AK, Tesarz J, Vossmerbaeumer U. Ocular wavefront analysis of aspheric compared with spherical monofocal intraocular lenses in cataract surgery: systematic review with metaanalysis. J Cataract Refract Surg. 2015;41:1088–97.CrossRefPubMed
18.
Higa R, Uozato H, Arai Y, Inoue K, Wakakura M. Accuracy of postoperative refraction as predicted using Holladay 2, Haigis and SRK/T formulas. Jpn J Ophthalm Surg. 2014;27:261–4 (in Japanese).
19.
20.
Nakagawa T, Maeda N, Higashiura R, Hori Y, Inoue T, Nishida K. Corneal topographic analysis in patients with keratoconus using three-dimensional anterior segment optical coherent tomography. J Cataract Refract Surg. 2011;37:1871–8.CrossRefPubMed
21.
Fukuda S, Beheregaray S, Hoshi S, Yamanari M, Lim Y, Hiraoka T. Comparison of three-dimensional optical coherence tomography and combining a rotating Scheimpflug camera with a Placido topography system for forme fruste keratoconus diagnosis. Br J Ophthalmol. 2013;97:1554–9.CrossRefPubMed
Metadata
Title
Detection of increase in corneal irregularity due to pterygium using Fourier series harmonic analyses with multiple diameters
Authors
Keiichiro Minami
Kazunori Miyata
Atsushi Otani
Tadatoshi Tokunaga
Shouta Tokuda
Shiro Amano
Publication date
01-05-2018
Publisher
Springer Japan
Published in
Japanese Journal of Ophthalmology / Issue 3/2018
Print ISSN: 0021-5155
Electronic ISSN: 1613-2246
DOI
https://doi.org/10.1007/s10384-018-0583-8

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